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Chris Hartjes' Blog:
Monkey-patching Is for Closers
July 16, 2012 @ 09:09:51

In this new post to his blog Chris Hartjes looks at why "monkey patching is for closers" - how it should be avoided in favor of making the code itself more testable rather than "hack" with the patching.

The use of monkey-patching is extremely prevalent in the Ruby community and also to a certain extent in Python usage. I'm not going to go into length about their use of it except to say that it seems quite common and I think most developers are using it as a shortcut to counter what might be poor code architecture decisions.

He includes some example code, excerpted from a blogging system where runkit was originally use to test its functionally. He shows how some simple refactoring (adding input parameters, replacing a static method call, etc) makes it easier to unit test. Comments to the post include further refactoring ideas as well as a response from the original "offender" whose post sparked Chris' response.

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monkey patch modify runkit unittest refactor



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